condition mean min max ZT0-3 28.25 28.25 28.25 ZT4-7 10.0 10.0 10.0 ZT8-11 32.4 32.4 32.4 ZT12-15 36.45 36.45 36.45 ZT16-19 20.150000000000002 20.150000000000002 20.150000000000002 ZT20-23 9.3 9.3 9.3